//
//  People.m
//  first
//
//  Created by 毕小强 on 16/10/31.
//  Copyright © 2016年 毕小强. All rights reserved.
//

#import "People.h"
@implementation People
-(NSNumber*)age{
    if (_age==nil) {
        self.age=[[NSNumber alloc]init];
    }
    return _age;
}
@end
